package ch.ethz.fcl.user.interaction;

import ch.ethz.fcl.draw.Bounds;
import ch.ethz.fcl.draw.Circle;
import ch.ethz.fcl.udp.UDPClient;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class MultiTouchHandler implements OnTouchListener {
	private final String TAG = "MultiTouchHandler";
	private final UDPClient client;
	private final Circle circle;
	private Matrix matrix = new Matrix();
	private Matrix savedMatrix = new Matrix();

	private PointF start = new PointF();
	private PointF mid = new PointF();

	private int mode;
	private final int FINGERUP = 0;
	private final int DRAG = 1;
	private final int ZOOM = 2;
	private final int ZOOMIN = 3;
	private final int ZOOMOUT = 4;

	private float oldDist = 0;

	public MultiTouchHandler(Circle circle) {
		this.client = new UDPClient("Hello from CrazyFrog");
		client.run();
		this.circle = circle;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// dumpEvent(event);

		switch (event.getAction() & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_DOWN:
			savedMatrix.set(matrix);
			start.set(event.getX(), event.getY());
			Log.d(TAG, "mode = DRAG");
			mode = DRAG;
			break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_POINTER_UP:
			mode = FINGERUP;
			Log.d(TAG, "mode = NONE");
			client.setMessage(FINGERUP);
			client.run();
			break;
		case MotionEvent.ACTION_MOVE:
			if (mode == DRAG) {
				matrix.set(savedMatrix);
				matrix.postTranslate(event.getX() - start.x, event.getY()
						- start.y);
				circle.x = event.getX();
				circle.y = event.getY();
				Log.d(TAG, "X: " + circle.x + " Y: " + circle.y);
				client.setMessage(DRAG + ":" + Bounds.getBoundX(circle.x) + ":"
						+ Bounds.getBoundY(circle.y));
			} else if (mode == ZOOM) {
				float newDist = spacing(event);
				Log.d(TAG, "newDist=" + newDist);
				if (newDist > 10f) {
					matrix.set(savedMatrix);
					float scale = newDist / oldDist;
					matrix.postScale(scale, scale, mid.x, mid.y);
					if (newDist > oldDist) {
						circle.radius += 5;
						client.setMessage(ZOOMOUT+":"+Bounds.getBoundX(circle.radius));
					} else if (circle.radius > 5) {
						circle.radius -= 5;
						client.setMessage(ZOOMIN+":"+Bounds.getBoundX(circle.radius));
					}
				}
			}
			client.run();
			circle.invalidate();
			break;
		case MotionEvent.ACTION_POINTER_DOWN:
			oldDist = spacing(event);
			Log.d(TAG, "oldDist=" + oldDist);
			if (oldDist > 10f) {
				savedMatrix.set(matrix);
				midPoint(mid, event);
				mode = ZOOM;
				Log.d(TAG, "mode = ZOOM");
			}
			break;
		}
		return true;
	}

	private float spacing(MotionEvent event) {
		float x = event.getX(0) - event.getX(1);
		float y = event.getY(0) - event.getY(1);
		return FloatMath.sqrt(x * x + y * y);
	}

	private void midPoint(PointF point, MotionEvent event) {
		float x = event.getX(0) + event.getX(1);
		float y = event.getY(0) + event.getY(1);
		point.set(x / 2, y / 2);
	}

	public void dumpEvent(MotionEvent event) {
		String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
				"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
		StringBuilder sb = new StringBuilder();
		int action = event.getAction();
		int actionCode = action & MotionEvent.ACTION_MASK;
		sb.append("event ACTION_").append(names[actionCode]);
		if (actionCode == MotionEvent.ACTION_POINTER_DOWN
				|| actionCode == MotionEvent.ACTION_POINTER_UP) {
			sb.append("(pid ").append(
					action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
			sb.append(")");
		}
		sb.append("[");
		for (int i = 0; i < event.getPointerCount(); i++) {
			sb.append("#").append(i);
			sb.append("(pid ").append(event.getPointerId(i));
			sb.append(")=").append((int) event.getX(i));
			sb.append(",").append((int) event.getY(i));
			if (i + 1 < event.getPointerCount())
				sb.append(";");
		}
		sb.append("]");
		Log.d(TAG, sb.toString());
	}
}
